Improved btnxiding-bxiochl and artificial stone



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JOHN LEFFLER, or." ROCH E STE R. NE W'YORK. Lam-s Patent No. 85,231, datcd becember 22, 1868.-

IMPROVED BUILDING-BLOCK AND an'rxrrcm sac-01m.

The Schedule referred to theseLetten Patent and making part of the same.

To all whom it may concern Be it known that I, J our: LEFFLER, of the city of Rochester, county of Munroe, and State of New York, have invented a certain new and useful Improvement in Artificial Stone; and 1 do hereby declare that the following is a full and exact description thereof.

My invention consists of an artificial stone, for building and other purposes, formed of gravel, Rosendale cement, quick-lime, and sea-sand, compounded in the manner and in the proportions as follows:

Take, of gravel, two bushels; Rosendale cement, one bushel; quick-lime,(slaked,) two quarts; sea-sand, one quart.

First mix the gravel and cement in their dry state, then mix with this compound the quick-lime, adding water to produce the desired consistency. In this condition place the mass inmoulds, and press solid. Then .remove the press, and work in the sea-sand upon the surface, say from one-half to one-inch in depth. Then smooth off the surface and allow the blocks to dry and harden, which will require several weeks time, to produce the requisite strength and color'for use.

This combination of parts produces astone as strong and enduring as the natural stone.

The gravel furnishes the stony material, to crystallize and hold the other parts; p

The quick-lime serves as a sort of cement or glue, to hold the gravel together, uniting the kernels, and thus forming a nucleus, to which the other parts ad-' here.

also serves as aproteotion and shield to the-interior of the block.

be original withmyself.

by Letters Patent, is-

Building-blocks, of artificial stone', compounded of the materials and in the proportions substantially as herein set forth.

Also, the method herein described, of producing materials herein set forth, and subsequently kneading d into the surface-portion of said blocks, after they leave the moulds, substantially as set forth.

In witness whereofi'l have hereunto signed my name. in the presence of two subscribing witnesses.

JOHN LEFFLER. Witnesses:

R. F. Oseoon,

J. A. DAVIS.

This process of applying the sea-sand I believe to What I claimas my invention, and desire to secure blocks of artificial stone, by moulding the same of the 

